and-- >> of what use is that? >> it's something that's never been done before, now, in the 1960's, when nasa did it with apollo 8, it wowed the world and this would do that except at mars and it's an effort to explore mars and for interest in space and prove it can be done. there are people who say it can't be. >> megyn: already people say it's kind of sad because you've got nasa scientists now tour guides at kennedy space center, offering tours to tourists instead of working on space missions and you've got this guy, dennis, along with rich buddies taking trips out to the space. >> i think private travel is the the future and nasa is looking to buy trips on private trips for its astronauts and the goal would be if you and i get to book a trip it mars some day. >> megyn: no, thanks, i'll keep my feet planted where they are. in russia they did an experiment with six astronauts simulated it in close confinement for 520 days, how did that go? >> surprisingly well. not only did they spend 17 months locked in a capsule